Window lock



\ J. BARRY March 27, 1951 WINDOW LOCK Filed Jan. 20, 1950 INVENTOR :fossky 532m.

BY a 524W ATTORNEY Patented Mar. 27, 1951 UNITED STATES PATENT OFFICE.

2,546,535 WINDOW LOCK seph B ry, R mond Hill, N. Y.

Application January 20, 1950, Serial No. 139,627

This invention relates to locking devices and more particularly to an auxiliary window lock to work in conjunction with the ordinary window sash lockwhich is conventional with window construction. This auxiliary lock prevents relative movement between the upper and lower sash units of the window.

An object of the invention is the provision of a novelly constructed window lock which may be quickly and easily operated from the inside of a. building but which when in its locked position will be fool-proof in its prevention of unauthorized entry into the building through the window. The particular design of the various working partsv of this look is such that the devicev is. not receptive to the many burglary techniques which continuously bring about the loss of property through crime.

Another object. of my present invention is to provide a locking device which can be easily applied to a window and when in place will not be unsightly.

Still further advantages of the invention lie in the fact that the device is simple in nature and inexpensive to. manufacture, yet at the same time, extremely sturdy in construction and effective in use.

These and other objects and advantages of the present, invention will become apparent. from the following description and the accompanying drawing in which:

Figure 1 is a perspective view of the invention installed for use on a window.

Figure 2 is. a. plan view of the window lockin the operative. position.

Figure, 3 is a view of the lock in the inoperative .lJQsition with the device shown in longitudinal se tion to show its interior structure.

Figure 4 is a side elevation of the locking bar.

Figure 5. is a perspective view showing one fm'm of pivot nut for use. with the device.

Figure 6 is a perspective. view of amodification of the pivot nut.

Similar reference characters in the several figures represent similar parts.

For many years the conventional sash lock commonly found on vertically movable windows has been found to be completely ineffective against skilled housebreakers. It is a. simple operation, for instance, to spread the window jambs apart. with a screw driver and then inserting a pen knife to. slide the locking element in an off position so that the sash panels may be moved in relation. to. one another to permit entrythrough the window, With this in mind the presentv in-- 5 Claims. (01. 292-453) meral I0 is of necessity small in size in order that it may be applied to the exposed surfaces of the upper window sash. The lock base l-l consists of a frame member having right-angle flanges I2 and I3. Flange l2 is provided with a pluralityof drilled apertures l4 adaptedto receive screws for use in securing the frame to the surface 15 of the vertical side member of the upper sash section. As best: seen in Figure 2 apertures I i are countersunk at their exposed ends to enable the fastening screw heads to lie flushwith face E6 of flange I 2 so that the closely adjacent upper and lower sash sections will pass freely without obstruction by protruding screwheads.

From the apex of base H, flange l3- extends along face t! of the side member toward the glass pane iii of the upper sash. For the purpose of illustration 1' have shown face I l as a flat surface normal to the plane of the window sash. However, it will be readily seen that if a window contains fanciful moulding instead of the flat surface shown at I1, then it is but necessary to offset flange l3 toward the center of the window to allow clearance for the moulding. It is not only unnecessary but also undesirable to provide screw holes in flange l3 since the working space permitted by the glass pane l8 would make installation of the device a diflicult task. Affixation of flange l2 alone is sufficient to. obtain proper securing of the lock to the window sash.

The locking bar 19 utilized in the present invention consists of a cast plate retained adjacent: to the frame II by means of a connecting pivot shaft 20. Shaft 20 is basically of cylindrical stock having a square end portion 2| adapted to. be snugly received by a mating aperture. 22v located in the lower half of flange l3. The similarly irregular configurations of end 2| and aperture 22 prevent relative rotation between the lock frame II and shaft 20 and lateral relative movement is likewise prevented by shoulder 23 (Fig. 5) and rivet head 24 (Fig. 3) formed on the shaft and abutting the opposing faces of flange I 3.

The outer end of shaft 26 carries a rotatable pivot nut 25 which is retained on the shaft by a rivet head 26. The specific shaft of the pivot a flat elongated body portion having a protruding bearing finger 29a formed at one end. The remaining portions of the pivot shaft 20a are identical with those of the form shown in Figure 5.

The pivot shaft 20 penetrates the locking bar by means of an opening 30 formed in the bar and being of greater diameter than shaft 20. This latter feature enables the locking bar to cant relative to the axis of the pivot shaft when the bar is moved to its off position as shown in Figure 3.

Concentrically'with opening 36 is formed a countersunk recess 3!. This recess receives a portion of a spiral spring 32 the, end of which abuts on a stepped shoulder 33 between recess 3| and the opening 30. The opposite end of spring 32 abuts the face 28 of the pivot nut to hold the spring in compression.

The previously mentioned cam track is in the form of a recess 34 milled in the outer surface 35 of the looking bar and having an inclined bottom 36 which acts as a cam when confronted by the rotating bearing finger 29 of the pivot nut.

different thickness produce a stepped-down effect leaving a contact face 38 which extends the width of the locking bar. The sash lock will be seen in its off or open position in Figure 3 of the drawing and in this position the locking arm is raised so that offset 3? lies adjacent the outer surface of flange 13 of the frame member. However, when the lock is closed the spring causes offset 37, then in a vertical position, to snap over the face of flange 12 (Figures 1 and 2) and from this point on upward rotation of the locking bar is impossible without first manually moving the bar laterally away from the frame member I I to "allow offset 3? to clear flange l2 of the frame.

As added security to the above described snap action locking function the cooperating pivot nut and cam may be used to positively hold the locking bar against lateral movement brought about by the insertion of a knife or other appropriate tool between adjacent faces of the window sash. The cam 36 has a high point and a low point. Pivot nut 25 being held against outward movement by the rivet head 26, may be rotated to selectively position its bearing finger on either the high or low point on the cam. From Figure 7 3 it will be seen that unless the low point of the 'cam is opposite the bearing finger, locking bar l9 may not be moved laterally away from its locked position relative to the frame H.

At this point it is important to note that the positioning of spring 32 between the locking bar and pivot nut provides an equalization of spring tension on each of these members. This is essential because when the bottom section of the win- 7 dow is rocked or forced by a would-be house- -breaker the pivotnut will remain in its correct position on the high point of the cam surface thereby rigidly holding the locking bar against lateral movement.

From the foregoing description of the various elements of the invention it is believed that the operation of the device will be readily apparent. To look the upper and lower sash panels of the window in place the locking bar [9 is rotated forwardly and downwardly until the offset portion snaps into closed position over the forward face of the frame member II. In this position the lower edge 39 of the bar will be horizontal and act as a stop preventing upward movement of the lower sash panel. Then to lock the bar in a closed position the pivot nut is rotated clockwise to bring the bearing finger upon the high point of the cam recess formed in the locking bar. Thus it will be seen that until the pivot nut is once again turned to release the cam the locking device may not be released even by the cleverest of housebreaking techniques.

Of course it will be readily seen that this same device may be applied to a bedroom window in such a manner as to permit the window to be slightly open for purposes of ventilation. For this arrangement it is but necessary to attach the frame member the desired distance above the point of application shown in Figure 1 oflthe drawing;

From the above detailed explanation of the invention it will be seen that I have devised a simple locking mechanism which presents the out departure from the invention as defined in the appended claims.

Iclaim:

1. A device for preventing relative movement between upper and lower window sashes comprising an angle frame having flanges disposed at right angles to each other, said frame being adapted to be secured to the upper sash, a shaft "attached at one end to said frame, a locking bar adjacent one of said flanges and supported by said shaft, said bar being rotatable relative to the frame to a locking position, an ofiset portion on said bar engageable with the other of said flanges when the bar is in said locking position, a knob rotatably mounted on the free end of said shaft and having an inwardly extending finger thereon, a cam surface formed on said locking bar cooperating with said finger to clamp the bar in engagement with said other flange of the frame,'and means mounted on the shaft for laterally urging the locking bar toward the frame.

2. A device for preventing relative movement between upper and lower window sashes coinprising an angle frame having flanges disposed at right angles to each other, said frame being adapted to be secured to the upper sash, a shaft attached at one end to said frame, a locking bar adjacent one of said flanges and supported by 1 said shaft, said bar being rotatable relative to the frame to a locking position, an offset portion'on said bar engageable with the other of said flanges "when the bar is in said locking position, a knob rotatably mounted on the free end of said shaft and having an inwardly extending finger thereon,

a cam surface formed. on said locking bar cooperating with said finger to clamp the bar in engagement with said other flange of the frame, and means mounted on the shaft between the knob and bar for laterally urging the locking bar toward the frame.

3. A device for preventing relative movement between upper and lower window sashes comprising an angle frame having flanges disposed at right angles to each other, said frame being adapted to be secured to the upper sash, a shaft attached at one end to said frame, a locking bar adjacent one of said flanges and supported by said shaft, said bar being rotatable relative to the frame to a locking position, an offset portion on said bar engageable with the other of said flanges when the bar is in said locking position, a knob rotatably mounted on the free end of said shaft and having an inwardly extending finger thereon, a cam surface formed on said locking bar cooperating with said finger to clamp the bar in engagement with said other flange of the frame, and a. spring mounted on the shaft for laterally urging the locking bar toward the frame.

4. A device for preventing relative movement between upper and lower window sashes comprising an angle frame having flanges disposed at right angles to each other, said frame being adapted to be secured to the upper sash, a shaft attached at one end to said frame, a locking bar adjacent one of said flanges and supported by said shaft, said bar being rotatable relative to the frame to a locking position, an offset portion on said bar engageable with the other of said flanges when the bar is in said locking position, a knob rotatably mounted on the free end of said shaft and having an inwardly extending finger thereon, a cam surface formed on said looking bar cooperating with said finger to clamp the bar in engagement with said other flange of the frame, and a spring mounted on the shaft between the knob and bar for laterally urging the locking bar toward the frame.

5. A device for preventing relative movement between upper and lower window sashes comprising an angle frame having flanges disposed at right angles to each other, said frame being adapted to be secured to the upper sash, a shaft attached at one end to said frame, a locking bar adjacent one of said flanges and supported by said shaft, said bar being rotatable relative to the frame to a locking position, an offset portion on said bar engageable with the other of said flanges when the bar is in said locking position, a knob rotatably mounted on the free end of said shaft and having an inwardly extending finger thereon, a cam surface formed on said locking bar cooperating with said finger to clamp the bar in engagement with said other flange of the frame, and a spring surrounding the shaft and having its ends bearing on the knob and bar for laterally urging the locking bar toward the frame.

JOSEPH BARRY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 564,294 Shepard et a1 July 21, 1896 822,505 Busch June 5, 1906 1,040,015 Riley Oct. 1, 1912 1,244,725 Gadke Oct. 30, 1917 1,904,291 Neilson et a1 Apr. 18, 1933 2,079,167 Hafstad May 4, 1937 

